The Mastervolt Charge Mate 1202 Charge Mate Pro 90 is a battery separation relay and charger designed for marine and automotive applications, specifically for systems with a second battery to prevent main battery discharge and ensure reliable engine starting. It features automatic coupling of both batteries during the charging process and disconnection during operation, enhancing safety and power management. This model is well-suited for smaller electrical systems and offers a transparent housing for easy visual inspection. With dimensions of approximately 15 cm in length, 10 cm in width, and 5 cm in height, and a weight of about 500 g, it provides a compact and durable solution. Made from high-quality materials, it ensures long-term reliability under various environmental conditions with an operating temperature range of -20 °C to 60 °C. The device supports efficient charging cycles, contributes to battery health, and extends lifespan. Ideal for use in boats, motorhomes, and other vehicles with dual battery systems, it delivers consistent performance without complex installations. Practical benefits include reduced risk of power failure and simplified maintenance, making it a trusted choice for enthusiasts and professionals alike.